The source of oil and gas is also originally from sun-powered photosynthesis. In the ancient oceans, certain basins had recurring algal blooms that bloomed, died and fell to the primeval seafloor. The algae were photosynthesis-driven phytoplankton that accumulated over the many millennia as layers of organic-rich muds. These layers were tens or hundreds of feet thick. They were buried deeply, and the thermogenic heat converted the organics first to oil and with higher temperatures to natural gas.
Based on this information, we can correctly refer to fossil fuels as natural solar-powered energy or, if you like, giant solar energy storage batteries!
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